US8561201B2 - Image reading apparatus, an image information verification apparatus, an image reading method, an image information verification method, and an image reading program - Google Patents

Image reading apparatus, an image information verification apparatus, an image reading method, an image information verification method, and an image reading program Download PDF

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US8561201B2
US8561201B2 US11/836,183 US83618307A US8561201B2 US 8561201 B2 US8561201 B2 US 8561201B2 US 83618307 A US83618307 A US 83618307A US 8561201 B2 US8561201 B2 US 8561201B2
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image
unique value
medium
information
image information
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US20080040813A1 (en
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Yoichi Kanai
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Ricoh Co Ltd
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Ricoh Co Ltd
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    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/60Protecting data
    • G06F21/64Protecting data integrity, e.g. using checksums, certificates or signatures
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/32Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
    • H04N1/32101Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
    • H04N1/32106Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title separate from the image data, e.g. in a different computer file
    • H04N1/32122Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title separate from the image data, e.g. in a different computer file in a separate device, e.g. in a memory or on a display separate from image data
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/32Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
    • H04N2201/3201Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
    • H04N2201/3204Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title of data relating to a user, sender, addressee, machine or electronic recording medium
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/32Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
    • H04N2201/3201Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
    • H04N2201/3225Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title of data relating to an image, a page or a document
    • H04N2201/3233Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title of data relating to an image, a page or a document of authentication information, e.g. digital signature, watermark
    • H04N2201/3236Details of authentication information generation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/32Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
    • H04N2201/3201Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
    • H04N2201/3269Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title of machine readable codes or marks, e.g. bar codes or glyphs
    • H04N2201/327Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title of machine readable codes or marks, e.g. bar codes or glyphs which are undetectable to the naked eye, e.g. embedded codes
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/32Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
    • H04N2201/3201Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
    • H04N2201/3274Storage or retrieval of prestored additional information
    • H04N2201/3276Storage or retrieval of prestored additional information of a customised additional information profile, e.g. a profile specific to a user ID

Definitions

  • the present invention relates to an image reading apparatus, an image information verification apparatus, an image reading method, an image information verification method, and an image reading program.
  • Patent Reference 1 discloses a paper identification/collation apparatus for identifying paper by observing and memorizing a random pattern of vegetable fiber that twines to form the paper.
  • Non Patent Reference 1 discloses a technique of identifying paper by observing the pattern of the vegetable fiber that twines to form the paper by a laser light.
  • Patent Reference 2 discloses a method of certifying that an image is acquired by scanning paper by adding an electronic signature when digital image data are acquired from the image on the paper.
  • Patent Reference 1 and Non Patent Reference 1 do not provide a method of associating the paper that is identified with the image formed on the paper, that is, even if the paper is identified, if the image formed on the paper is tampered with, tampering cannot be detected.
  • Patent Reference 2 although an electronic signature is added to digital image data acquired by scanning an image on a first medium, when the image based on the digital image data is formed on a second medium, the image on the second medium cannot be differentiated from the image on the first medium. For this reason, it is difficult to prevent unauthorized copying of the image.
  • the present invention provides an image reading apparatus, an image information verification apparatus, an image reading method, an image information verification method, and an image reading program that solve the problems by associating an image formed on a medium with a description of the medium.
  • the present invention provides an image reading apparatus, an image information verification apparatus, an image reading method, an image information verification method, and an image reading program that substantially obviate one or more of the problems caused by the limitations and disadvantages of the related art.
  • an embodiment of the invention provides an image formation apparatus and an image information verification apparatus as follows.
  • the image formation apparatus includes an image reading unit for reading an image on a medium, an image acquiring unit for acquiring the image ready by the image reading unit,
  • a medium description receiving unit for receiving a medium description of the medium
  • a set generating unit for generating a set (a combination) of information about the image and information about the medium description
  • a set unique value acquiring unit for acquiring a unique value of the set (a set unique value).
  • the image reading apparatus configured as above associates an image formed on a medium with a description of the medium.
  • the image reading apparatus includes a compound image information generation unit for generating compound image information wherein an image information table that contains the set unique value, information about the medium description, and information about the image is associated with the image.
  • the image reading apparatus as configured above generates the compound image information, wherein the image information table contains the information about the medium description associated with the image.
  • the image reading apparatus includes an image unique value acquisition unit for acquiring a unique value of the image, and the set generating unit generates a set by associating the image unique value with the information about the medium description.
  • the image reading apparatus that generates the compound image information containing the set of the image unique value associated with the information about the medium description is provided.
  • the image reading apparatus includes a medium unique value acquisition unit for acquiring a unique value of the medium description, and the set generating unit generates a set by associating the information about the image with the medium unique value.
  • the image reading apparatus that generates the compound image information containing the set of the information about the image and the medium unique value of the medium description is provided.
  • the set generating unit of the image reading apparatus when there are two or more media, the set generating unit of the image reading apparatus generates the set for each of the media, and generates a list of the sets, and the set unique value acquisition unit acquires a unique value from the list.
  • the image reading apparatus associates the list that contains the sets of the information about two or more images, and the images with the information about the medium description.
  • the image reading apparatus includes an electronic signature generation unit for generating electronic signature information for a unique value acquired by the set unique value acquisition unit, and the image information table contains the electronic signature information.
  • the image reading apparatus that generates the electronic signature information for the unique value is provided.
  • the embodiment further provides the image information verification apparatus for verifying the compound image information generated by the image reading apparatus, which image information verification apparatus includes an image information table verification unit, and an image verification unit for verifying the image associated with the image information table.
  • the image information verification apparatus verifies the image information table and the image.
  • the image information verification apparatus includes a communications unit for communicating with a server that stores the information about the medium description, and a medium description collation unit for collating the information about the medium description contained in the compound image information with the information about the medium description acquired from the server.
  • the image information verification apparatus compares the medium description stored in the server with the medium description contained in the compound image information.
  • a set unique value acquisition step of acquiring the set unique value of the set a set unique value acquisition step of acquiring the set unique value of the set.
  • the image reading method includes a compound image information generation step of generating the compound image information wherein the image is associated with the image information table containing the set unique value, the information about the medium description, and the information about the image.
  • the image reading method includes an image unique value acquisition step of acquiring an image unique value of the image, wherein the set generation step generates a set of the image unique value and the information about the medium description.
  • the image reading method includes a medium unique value acquisition step of acquiring the unique value of the medium description, wherein the set generation step generates a set of the information about the image and the medium unique value.
  • the set generation step of the image reading method when there are two or more media, the set generation step of the image reading method generates a list of sets corresponding to the media, and the set unique value acquisition step acquires a unique value of the list.
  • the image reading method includes an electronic signature generation step of generating electronic signature information of the unique value acquired by the set unique value acquisition step, wherein the image information table contains the electronic signature information.
  • the embodiment further provides the image information verification method carried out by the image information verification apparatus, which method is for verifying the compound image information generated by the image reading unit.
  • the image verification method includes an image information table verification step of verifying the image information table, and an image verification step of verifying the image associated with the image information table.
  • the image information verification method includes
  • the embodiment further provides an image reading program for a computer to perform the image reading method and the image information verification method described above.
  • an image formed on a medium is associated with a medium description of the medium.
  • FIG. 1 is a block diagram of an image reading apparatus according to the present invention
  • FIG. 2 is a detailed block diagram of the image reading apparatus according to the present invention.
  • FIG. 3 is a schematic diagram showing flows of data processed by the image reading apparatus of the present invention.
  • FIG. 4 is a flowchart of a process carried out by the image reading apparatus of the present invention.
  • FIG. 5 is a flowchart of a process carried out by the image reading apparatus of the present invention when acquiring an image and a medium description;
  • FIG. 6 is a flowchart of a process carried out when generating a set of information about an image and information about the medium description;
  • FIG. 7 is a block diagram of an image information verification apparatus according to the present invention.
  • FIG. 8 is a schematic diagram showing flows of data processed by the image verification apparatus of the present invention.
  • FIG. 9 is a flowchart of a process carried out by the image information verification apparatus of the present invention.
  • FIG. 10 is a flowchart of a process carried out by the image information verification apparatus of the present invention when verifying the information about the image;
  • FIG. 11 is a flowchart of a process carried out by the image information verification apparatus of the present invention when verifying the information about the medium description;
  • FIG. 12 is a schematic diagram showing a process storing a public key in the image reading apparatus.
  • FIG. 1 shows the configuration of an image reading apparatus 1 according to the embodiment of the present invention.
  • the image reading apparatus 1 generates compound image information 9 that includes an image read from a paper document 3 based on directions of an operator 2 .
  • the image reading apparatus 1 includes a main control unit 100 .
  • the image reading apparatus 1 may further include an electronic signature processing unit 200 , an image reading unit 300 , a medium description acquisition unit 400 , a communications unit 500 , a data storage 600 , and a display/operation unit 700 .
  • the main control unit 100 controls processes carried out by the image reading apparatus 1 .
  • the main control unit 100 generates a set of first information about the image read from the paper document 3 and second information about the medium description of the paper document 3 , that is, the first information of the set is associated with the second information of the set. Further, the main control unit 100 generates the compound image information 9 that contains the information about the set and the image.
  • the electronic signature processing unit 200 generates electronic signature information for target data such as the information about the set, and the like, generated by the main control unit 100 .
  • the image reading unit 300 is for reading an image formed on a medium such as the paper document 3 .
  • the image reading unit 300 reads the image and outputs the image to the main control unit 100 .
  • the image reading unit 300 is preferably a scanner; however, other devices such as a camera can serve the purpose so long that the image formed on the medium can be digitally acquired.
  • the medium description acquisition unit 400 is for measuring and acquiring a value of the medium description of a medium, such as paper.
  • the medium description may be any item so long as a unique value can be obtained for identifying the medium; for example, a wave form of dispersion intensity of a laser light dispersed by twining fiber that constitutes the paper (Non Patent Reference 1), an image of a light that penetrates the twining fiber of the paper (Patent Reference 3), and an irregularity of the surface of a magnetic medium (Patent Reference 3).
  • the communications unit 500 is for communicating with an external apparatus such as a server that is connected either directly or through a network 800 .
  • the communications unit 500 may transmit the compound image information 9 of the image that is read by the image reading unit 300 and processed by the main control unit 100 to the external apparatus, and the like.
  • the data storage 600 is for storing data that the image reading apparatus 1 processes.
  • the data storage 600 may store the compound image information 9 about the image read by the image reading unit 300 .
  • the data storage 600 may further store a program that the main control unit 100 , and the like, is to execute, and may serve as a working memory when the main control unit 100 , and the like, executes the program.
  • the data storage 600 may store a private key that is used by the image reading apparatus 1 when generating an electronic signature so that the private key cannot be read from the exterior of the image reading apparatus 1 .
  • the data storage 600 may hold a public key or a public key certificate corresponding to the private key.
  • the display/operation unit 700 is for input directions about a process that the image reading apparatus 1 performs, and displays the status of the image reading apparatus 1 , and the like.
  • FIG. 2 shows an example of the functional configuration of the image reading apparatus of the present invention.
  • FIG. 2 gives details of the image reading apparatus 10 containing the main control unit 100 always included in the image reading apparatus of the present invention among the functional units that are included in the image reading apparatus 1 of FIG. 1 .
  • the image reading apparatus 10 shown in FIG. 2 includes the main control unit 100 .
  • the image reading apparatus 10 may further include the electronic signature processing unit 200 .
  • the main control unit 100 carries out processes to realize functions of the image reading apparatus 10 , and performs further control of each functional unit and apparatus that is connected to the image reading apparatus 10 .
  • the main control unit 100 includes a unique value acquisition unit 110 , a set generating unit 120 , an image acquisition unit 130 , and a medium description receiving unit 140 .
  • the main control unit 100 may further include a compound image information generation unit 190 .
  • the unique value acquisition unit 110 is for acquiring a characteristic value (unique value) expressing a description of, e.g., an image.
  • a characteristic value is a value uniquely given to an object, since the amount of operations for determining that there are no overlapping values is great, (that is, since the amount of operations for acquiring a truly unique value is great), a quasi-unique value such as a hash value may be used.
  • the unique value acquisition unit 110 includes a set unique value acquisition unit 111 .
  • the unique value acquisition unit 110 may include an image unique value acquisition unit 112 and a medium description unique value acquisition unit 113 .
  • the set unique value acquisition unit 111 is for generating a characteristic value (unique value) of a set of the information about the image and the information about the medium description that the set generating unit 120 generates. Where the set generating unit 120 generates a list of two or more sets of the information about an image and the information about the medium description, the set unique value acquisition unit 111 generates a characteristic value of the list.
  • the image unique value acquisition unit 112 generates a characteristic value (unique value) of the image read by the image reading unit 300 and acquired by the image acquisition unit 130 .
  • the medium description unique value acquisition unit 113 generates a characteristic value (unique value) of the medium description acquired by the medium description acquisition unit 400 and received by the medium description receiving unit 140 .
  • the set generating unit 120 generates a set of the image acquired by the image acquisition unit 130 and the medium description received by the medium description receiving unit 140 .
  • the set generating unit 120 may generate a set of information about the image and information about the medium description.
  • the information about the image is either the image or the characteristic value of the image
  • the information about the medium description is either the medium description or the characteristic value of the medium description.
  • the set generating unit 120 includes an image-medium set generating unit 121 and the list generation unit 122 .
  • the image-medium set generating unit 121 is for generating a set of an image acquired by the image acquisition unit 130 and the medium description corresponding to the image.
  • the list generation unit 122 is for generating a list that contains two or more sets of the information about the image and the information about the medium description.
  • the image acquisition unit 130 is for acquiring an image from the image reading unit 300
  • the medium description receiving unit 140 is for receiving the medium description from the medium description acquisition unit 400 .
  • the image reading unit 300 and the medium description acquisition unit 400 are outside of the image reading apparatus 10 according to the configuration shown in FIG. 2 , the present invention is not limited to this configuration.
  • the image reading unit 300 and the medium description acquisition unit 400 may be included in the image reading apparatus as shown in FIG. 1 , then acquisition of the image on the medium and the medium description of the medium can be carried out by one apparatus, and associating the information about the image with the information about the medium description can be facilitated with improved accuracy.
  • the compound image information generation unit 190 is for generating compound image information 9 that includes the characteristic value acquired by the unique value acquisition unit 110 and the image acquired by the image acquisition unit 130 .
  • the compound image information 9 generated by the compound image information generation unit 190 may include electronic signature information of the characteristic value acquired by the unique value acquisition unit 110 . In this way, an apparatus that acquires the compound image information 9 can detect an alteration of an image, a characteristic value, and the like, by verifying the compound image information 9 with the electronic signature.
  • the electronic signature processing unit 200 includes an electronic signature generation unit 201 for generating an electronic signature for the unique value provided by the unique value acquisition unit 110 .
  • the electronic signature generation unit 201 When a set unique value is provided, the electronic signature generation unit 201 generates an electronic signature for the set unique value.
  • the electronic signature generation unit 201 generates an electronic signature for the unique value of a list, when the unique value of the list containing two or more sets is provided as the set unique value.
  • the display/operation unit 700 includes an input unit 701 and a display unit 702 .
  • the input unit 701 is for the operator 2 to input operational directions to the image reading apparatus 10
  • the display unit 702 is for displaying the status of the image reading apparatus 10 among other things.
  • the input unit 701 and the display unit 702 may be combined into one apparatus that may include a liquid-crystal touch panel.
  • the image reading unit 300 , the medium description acquisition unit 400 , the communications unit 500 , and the data storage 600 shown in FIG. 2 are the same as shown in FIG. 1 , and their descriptions are not repeated.
  • FIG. 3 shows the data flow of the image reading apparatus of the present invention when the compound image information 9 is generated from an image on the medium.
  • images and medium descriptions of the paper document 3 that consists of n pages are acquired, and the compound image information 9 is generated.
  • pages 3 a through 3 n of the paper document are read by the image reading unit 300 , and images D 1 through Dn, respectively, are acquired by the image acquisition unit 130 .
  • image unique values h 1 through hn are generated by the image unique value acquisition unit 112 corresponding to the imaged D 1 through Dn.
  • the medium description acquisition unit 400 acquires medium descriptions p 1 through pn for the pages 3 a through 3 n , respectively, and the acquired medium descriptions are provided to the medium description receiving unit 140 .
  • the set generating unit 120 generates a set of the unique value h of the image and the medium description p of every page, and generates a list of the sets for all the pages of the read paper document 3 .
  • the set unique value acquisition unit 111 generates a unique value hd of the list, and provides the unique value to the electronic signature processing unit 200 .
  • the electronic signature generation unit 201 generates an electronic signature (“sign” in FIG. 3 ) corresponding to the list and a digital signature table DST that include the list and the electronic signature.
  • the DST generated by the electronic signature generation unit 201 may contain the public key certificate (“cert” in FIG. 3 ).
  • the compound image information generation unit 190 associates the DST generated by the electronic signature generation unit 201 with the images D 1 through Dn acquired by the image acquisition unit 130 and generates the compound image information 9 .
  • FIGS. 4 through 6 are flowcharts of processes that the image reading apparatus according to the embodiment of the present invention performs.
  • FIG. 4 shows an outline of the processes.
  • FIG. 5 shows an acquisition process of acquiring the image and the medium description.
  • FIG. 6 shows an acquisition process of acquiring a characteristic value (unique value).
  • step S 101 the image reading unit 300 and the medium description acquisition unit 400 acquire the image on the paper document 3 and the medium description of the paper document 3 , respectively.
  • FIG. 5 shows details of Step S 101 in FIG. 4 , wherein an example of a process of acquiring the image and the medium description is shown.
  • the process of step S 101 is carried out by the image reading apparatus; however, the process may be carried out by an apparatus that is capable of image reading, and capable of measuring the descriptions of the medium, which apparatus is connected to the image reading apparatus.
  • the display unit 702 displays an input screen for inputting scanning directions.
  • scanning directions are provided by the input unit 701 .
  • the image reading unit 300 reads the image D 1 on the first page of the paper document 3 .
  • the image reading unit 300 may read the image based on a reading request provided by the main control unit 100 .
  • the medium description acquisition unit 400 acquires the medium description p 1 of the first page of the paper document 3 .
  • the medium description acquisition unit 400 may acquire the medium description based on an acquisition request provided by the main control unit 100 .
  • step S 15 the main control unit 100 determines whether image reading and the medium description acquisition are completed for all the pages of the paper document 3 that are input into the image reading apparatus 10 . If the determination is affirmative, the process proceeds to step S 102 . If the determination is negative, the process returns to step S 13 .
  • step S 13 and step S 14 following step S 15 image reading and medium description acquisition are performed about the next page of the paper document 3 processed after the page processed at the last step S 13 and the last step S 14 .
  • step S 11 By processing step S 11 through step S 15 , acquisition of the image and the medium description is completed about the paper that constitutes the paper document 3 .
  • step S 102 the unique value acquisition unit 110 acquires characteristic values (unique values) of the images, and the like.
  • FIG. 6 shows details of step S 102 , wherein the flow of an example of a process of generating a set of information about the image and information about the medium description is illustrated.
  • step S 21 the image acquisition unit 130 acquires the image read by the image reading unit 300 .
  • the medium description receiving unit 140 receives the medium description acquired by the medium description acquisition unit 400 .
  • step S 21 and step S 22 may be performed either for every medium, or for all the medium descriptions after all the images are acquired. In either case, each step S 22 may be performed in parallel with its corresponding previous step S 21 in a pipeline manner.
  • the image unique value acquisition unit 112 acquires the unique value h 1 of the first page.
  • step S 24 the medium description unique value acquisition unit 113 acquires a unique value phi of the medium description.
  • step S 25 the main control unit 100 determines whether the processes of step S 23 and step S 24 are completed for all the images that are acquired at step S 21 . If the determination is affirmative, the process proceeds to step S 26 . If the determination is negative, it returns to step S 23 .
  • step S 23 and step S 24 following step S 25 unique values of the image and the medium description of the page processed after the page processed at the last step S 23 and the last step S 24 are acquired.
  • the image-medium set generating unit 121 generates a group of sets of information about an image and information about the medium description for every page of the paper document 3
  • the list generation unit 122 generates a list of the sets corresponding to all the images acquired at step S 21 .
  • the set generated by the image reading apparatus of the present invention may be any of sets of
  • step S 23 a unique value of an image and a medium description, and an image and a medium description.
  • step S 24 the unique value of the image acquired by the image unit 130 , and the like, are acquired.
  • the electronic signature generation unit 200 generates the electronic signature for the set or the list generated at step S 102 , and generates the DST.
  • the compound image information generation unit 190 generates the compound image information 9 by associating the image acquired at step S 101 with the DST generated at step S 103 .
  • FIG. 7 is a block diagram of an example of the functional configuration of an image information verification apparatus 90 according to the embodiment of the present invention.
  • the image information verification apparatus 90 acquires the compound image information 9 , compares a characteristic value, etc., and determines whether the image contained in the compound image information 9 has been tampered with.
  • the image information verification apparatus 90 includes a main control unit 900 .
  • the image information verification apparatus 90 may include the electronic signature processing unit 210 .
  • the image information verification apparatus 90 is connected to the display/operation unit 710 , a communications unit 510 , and the data storage 610 so that functions, such as inputting directions, I/O for an external apparatus, and data storing are realized.
  • the main control unit 900 includes a compound image information acquisition unit 930 , a unique value acquisition unit 910 , and a compound image information verification unit 920 .
  • the compound image information acquisition unit 930 is for acquiring the compound image information 9 (see FIG. 1 ) generated by the image reading apparatus of the present invention.
  • the unique value acquisition unit 910 is for acquiring the characteristic value (unique value) of the image or the medium description contained in the compound image information 9 that the compound image information acquisition unit 930 acquires.
  • the characteristic value is a value about the target description and is a value uniquely given to an object; however, a quasi-unique value such as a hash value may also be used, because the amount of operations for determining that there are no overlapping values is great. Then, for example, SHA-1 is used for a hash function.
  • the unique value acquisition unit 910 includes a set unique value acquisition unit 911 , an image unique value acquisition unit 912 , and a medium description unique value acquisition unit 913 .
  • the set unique value acquisition unit 911 is for generating the characteristic value of a set of an image and a medium description corresponding to the image that the compound image information 9 contains. Out of the DST contained in the compound image information 9 , the set unique value acquisition unit 911 acquires a set of the image and the medium description corresponding to the image, and generates the characteristic value of the set. Further, when the compound image information 9 contains two or more images, the set unique value acquisition unit 911 acquires a list that contains two or more sets of an image and associated medium description corresponding to the image out of the DST contained in the compound image information 9 , and generates a characteristic value of the list.
  • the image unique value acquisition unit 912 is for generating and acquiring a characteristic value for every image contained in the compound image information 9 .
  • the medium description unique value acquisition unit 913 is for generating and acquiring a characteristic value of the medium description contained in the compound image information 9 .
  • the compound image information verification unit 920 is for determining whether tampering such as making an alteration has occurred in the image contained in the compound image information 9 .
  • the compound image information verification unit 920 determines the occurrence of tampering by comparing the unique value that the unique value acquisition unit 910 acquires with the unique value contained in the compound image information 9 .
  • the compound image information verification unit 920 includes an image information table verification unit 921 , an image verification unit 922 , a medium description verification unit 923 , and a medium description collation unit 924 .
  • the image information table verification unit 921 compares the unique value of the list or the set acquired by the set unique value acquisition unit 911 with the unique value of the list or the set contained in the compound image information 9 . When both are in agreement, it is determined that no tampering has occurred in the list or the set.
  • the image verification unit 922 compares the unique value of the image acquired by the image unique value acquisition unit 912 with the unique value of the image contained in the compound image information 9 . When both are in agreement, it is determined that no tampering has been performed on the image.
  • the medium description verification unit 923 compares the unique value of the medium description acquired by the medium description unique value acquisition unit 913 with the unique value of the medium description contained in the compound image information 9 . When both are in agreement, it is determined that the medium description has not been tampered with.
  • the medium description collation unit 924 determines whether a medium description that is in agreement with the medium description contained in the compound image information 9 is contained in a medium description database that is not illustrated. In this way, it is determined whether a medium having the medium description is already stored in the database. In addition, whether tampering has occurred is determined by the compound image information verification unit 920 depending on the agreement of the unique value acquired by the unique value acquisition unit 910 and the unique value contained in the compound image information 9 .
  • the “agreement” may not be limited to a complete “agreement”; but may include an “agreement” to a predetermined degree.
  • the electronic signature processing unit 210 includes an electronic signature decoding unit 211 for decoding the electronic signature information contained in the compound image information 9 .
  • the electronic signature decoding unit 211 decodes the electronic signature information contained in the compound image information 9 with a public key corresponding to the electronic signature information.
  • the public key may be either beforehand contained in the compound image information 9 , or acquired from a predetermined server by the communications unit, etc.
  • the image information verification apparatus 90 is connected to the communications unit 510 that communicates with an apparatus such as a server that is either directly connected or connected through a network.
  • the image information verification apparatus 90 is connected to a data storage 610 for storing the compound image information 9 , and the like.
  • the data storage 610 may store a program for the image information verification apparatus 90 to execute when the image information verification apparatus 90 is constituted as a computer.
  • the data storage 610 may be used as working memory when the image information verification apparatus 90 executes the program.
  • the image information verification apparatus 90 is connected to a display/operation unit 710 for inputting directions and displaying the status of the image information verification apparatus 90 .
  • the display/operation unit 710 includes an input unit 711 and a display unit 712 .
  • the input unit 711 is for providing directions for executing a process in the image information verification apparatus 90
  • the display unit 712 is for displaying the status of the image information verification apparatus 90
  • the input unit 711 and the display unit 712 may be constituted as one apparatus having a liquid-crystal touch panel.
  • FIG. 8 shows an example of the data flow when acquiring data, such as an image, from the compound image information 9 and verifying according to the embodiment of the image information verification apparatus of the present invention.
  • the compound image information 9 contains images of the paper document 3 that consists of n pages.
  • the compound image information 9 contains images D 1 through Dn and the DST of the paper document 3 .
  • the image unique value acquisition unit 912 generates unique values h 1 ′ through hn′ corresponding to the images D 1 through Dn, respectively.
  • the compound image information verification unit 920 acquires the DST from the compound image information 9 , and further acquires the unique values h 1 through hn from the images contained in the DST.
  • the image verification unit 922 compares the unique values h 1 ′ through hn′ generated by the image unique value acquisition unit 912 with the corresponding unique values of the images acquired from the DST to determine if they agree. When they agree, it is determined that no tampering has occurred. Since the unique values are compared for every image, when only some images are tampered with out of the images, the tampered-with images can be identified.
  • the set unique value acquisition unit 911 generates and acquires a unique value Hd′ of a list containing the set of the unique values of the images and the medium descriptions that are included in the DST.
  • the electronic signature decoding unit 211 decodes the electronic signature (“sign” in FIG. 8 ) of the unique value of the list included in the DST, and acquires a unique value hd.
  • the image information table verification unit 921 compares the unique value Hd′ of the list that the set unique value acquisition unit 911 acquires with the unique value hd of the list decoded by the electronic signature decoding unit 211 . When they (Hd′ and hd) agree, it is determined that the unique values of the medium description and the image have not been tampered with.
  • the medium description collation unit 924 compares the medium description included in the DST with the medium description stored in a medium description database, such as a server.
  • a medium description database such as a server.
  • the image information verification apparatus of the present invention may be configured such that the compound image information 9 contains the unique value of the medium description.
  • the medium description database may be included in any of the image reading apparatus of the present invention, the image information verification apparatus of the present invention, and other servers so long that the image information verification apparatus of the present invention is able to acquire the medium description from the medium description database.
  • the medium description collation unit 924 is included in the image information verification apparatus according to the embodiment of the present invention
  • the medium description collation unit 924 may be included in a server that has the medium description database.
  • the image information verification apparatus transmits acquired medium information to the server, and the server determines whether a medium description that agrees with the medium description received is stored in the medium information database, and transmits a result to the image information verification apparatus.
  • FIG. 9 shows the outline of the flow.
  • FIG. 10 shows the flow of image verification.
  • FIG. 11 shows the flow of medium description verification.
  • step S 301 the image verification unit 922 verifies an image contained in the compound image information 9 . Details of step S 301 are described with reference to FIG. 10 .
  • step S 31 the compound image information acquisition unit 930 acquires the compound image information 9 .
  • the compound image information 9 may be acquired, for example, by reading data stored in the data storage 610 of the image information verification apparatus 90 ,
  • the image unique value acquisition unit 912 acquires an image from the compound image information 9 .
  • the compound image information 9 includes two or more images, the pages are processed for every page.
  • the image unique value acquisition unit 912 generates and acquires the unique value of the image acquired at step S 32 .
  • the image verification unit 922 acquires the unique value of the image from the compound image information 9 , and compares it with the unique value of the image acquired at step S 33 . When the two unique values are in agreement, it is determined that the image has not been tampered with.
  • step S 35 the main control unit 900 determines whether verification of the unique value is completed for all the images contained in the compound image information 9 . If the determination is affirmative, the process proceeds to step S 302 . Otherwise, the process returns to step S 32 so that the next image is verified.
  • step S 302 it is determined whether tampering has occurred in the medium description contained in the compound image information 9 .
  • the process of step S 302 is performed when the compound image information 9 contains the unique value of the medium description. Details of step S 302 are described with reference to FIG. 11 .
  • the medium description unique value acquisition unit 913 acquires the medium description contained in the compound image information 9 .
  • the compound image information 9 includes two or more images
  • processes of step S 41 through step S 43 are performed for a medium description corresponding to each of the images.
  • the medium description unique value acquisition unit 913 generates and acquires the unique value of the medium description that is acquired at step S 41 .
  • the medium description verification unit 923 compares the unique value of the medium description acquired at step S 41 with the unique value of the medium description contained in the compound image information 9 . If the two unique values match, it is determined that no tampering has occurred in the medium description.
  • step S 44 the main control unit 900 determines whether verification of the unique value is completed for the medium description of all the images contained in the compound image information 9 . If the determination is affirmative, the process proceeds to step S 303 . Otherwise, the process is returned to step S 41 so that the verification of the medium description of the next image is performed.
  • the set unique value acquisition unit 911 generates and acquires a unique value of either the list or the set contained in the DST.
  • the electronic signature decoding unit 211 decodes the electronic signature (“sign”) of the unique value of the list, or the set, as applicable, contained in the DST, and acquires the unique value.
  • the image information table verification unit 921 compares the unique value generated by the set unique value acquisition unit 911 with the unique value decoded by the electronic signature decoding unit 211 . If the two unique values agree, it is determined that no tampering has occurred in the list or the set, as applicable.
  • the medium description collation unit 924 compares the medium description stored in the medium description database that is not illustrated with the medium description contained in the compound image information 9 in order to determine whether the medium description contained in the compound image information 9 is already stored in the medium description database.
  • FIG. 12 is a schematic drawing for explaining a process of storing a public key carried out by the image reading apparatus, when the image reading apparatus and the image information verification apparatus according to the embodiment of the present invention process the compound image information 9 using an electronic signature with a public key code.
  • a scanner is used for an example of the image reading apparatus in FIG. 12 .
  • a pair of a private key and a corresponding public key is generated, and the private key is stored in the scanner.
  • the private key is stored in a memory unit, and accessing the memory unit from the outside is limited among memory units of the scanner.
  • a certificate (cert) of the public key is published by a certificate authority of the manufacturer of the scanner, and is stored in the scanner.
  • the certificate of the public key is contained in the DST when the compound image information generation unit 190 generates the DST. In this way, the electronic signature may be decoded with the corresponding public key.
  • the image reading apparatus of the present invention may use other means and methods that realize the function of the electronic signature.

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